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US 9,540,880 B2Granted
Magnetic latching device for downhole wellbore intercept operations
AssigneeSchlumberger Technology Corporation
InventorsGraham Arthur McElhinney, Charles Henry Duck, Jr., Christopher William Lillis
Life of this patent
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Abstract
A downhole magnetic latching tool includes at least one permanent magnet deployed on a non-magnetic tool body. A magnetically permeable housing is deployed about the permanent magnet. The magnetic latching tool provides an attractive magnetic force between a drill string and a cased target wellbore.
Claims9
A method for intercepting and penetrating a cased subterranean target wellbore, the method comprising:
- (a) deploying a drill string in a drilling well, the drill string including a drill bit and a magnetic latching tool, the magnetic latching tool including a plurality of permanent magnets deployed on an outer surface of a nonmagnetic tool body, the permanent magnets being circumferentially aligned with one another on the tool body and magnetized in a radial direction, the magnetic latching tool further including a magnetically permeable housing deployed about the plurality of permanent magnets and in contact with the outer surfaces of each of the magnets;
- (b) drilling the drilling well substantially parallel with and adjacent to the cased target wellbore;
- (c) rotating the drill string so that the permanent magnets magnetically engage the cased target wellbore;
- and
- (d) forming an opening in the cased target wellbore.
2 more elements
Dependencies are inferred from the claim text.